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mhbell

AZ & TX in Winter - Ogden, UT Summer

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Posted: 07/16/19 09:24am Link  |  Quote  |  Print  |  Notify Moderator

mhbell
Sailun Tire inflation tables
I just installed a set of 6 Sailun tires on my four winds Infinity. I can't find a load or inflation table that will tell me what to air the tires up other than the max psi pressure. The Mtr HM mfgr says 85 Lbs psi The steel rims have a max pressure of 110 lbs psi. I am wondering if I could reduce the tire pressure from Max to say 85 or 90 lbs psi without being under inflated. The tires at max inflation will carry 5500 lbs more weight than the max allowed for the motor home GVWR I am below GVWR for the motor home weighed on a cat scale. would like to reduce tire pressure from max for a better ride if it can be done safely. Anyone in the forum running Sailun Tires in the 245/70R19.5 size. what pressure do you run? see chart below.
Mel
Sailun Tire Table

size ^^^^^^^^^^16 Ply^^^^^^^Single tire ^^Dual Tire^^max psi
245/70R19.5 ****M 16 ************4940 ********4675 *******120 lbs psi


2004 Thor Four Winds Infinity R32 Class A Motor Home with F-53 Ford Chassis. Toad is a 2017 Jeep Cherokee Trailhawk.

DrewE

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Posted: 07/16/19 10:02am Link  |  Quote  |  Print  |  Notify Moderator

Look up the tire inflation chart for any manufactuer of the same type, size, and ply rating of tire. The pressures and weights are the identical, or close enough to identical to not matter for practical purposes. (If they were not consistent across tire manufacturers, the vehicle makers would not be able to give their recommended tire pressures on the sticker without specifying a specific tire make and model.) Here's the relevant data from Michelin; note that these weights are axle weights, and so must be divided by two or by four for a single tire's weight rating at the pressure:

 75 psi: 6780 lbs single, 12840 lbs dual
 80 psi: 7140 lbs single, 13520 lbs dual
 85 psi: 7500 lbs single, 14200 lbs dual
 90 psi: 7850 lbs single, 14860 lbs dual
 95 psi: 8200 lbs single, 15520 lbs dual
100 psi: 8540 lbs single, 16160 lbs dual
105 psi: 8880 lbs single, 16800 lbs dual
110 psi: 9220 lbs single, 17440 lbs dual
115 psi: 9550 lbs single, 18080 lbs dual
120 psi: 9880 lbs single, 18700 lbs dual

Of course, you should never exceed the maximum pressure rating for your wheels, nor the maximum pressure stamped on the sidewall of the tire.





mhbell

AZ & TX in Winter - Ogden, UT Summer

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Posted: 07/16/19 10:23am Link  |  Quote  |  Print  |  Notify Moderator

DrewE wrote:

Look up the tire inflation chart for any manufactuer of the same type, size, and ply rating of tire. The pressures and weights are the identical, or close enough to identical to not matter for practical purposes. (If they were not consistent across tire manufacturers, the vehicle makers would not be able to give their recommended tire pressures on the sticker without specifying a specific tire make and model.) Here's the relevant data from Michelin; note that these weights are axle weights, and so must be divided by two or by four for a single tire's weight rating at the pressure:

?75 psi: 6780 lbs single, 12840 lbs dual
?80 psi: 7140 lbs single, 13520 lbs dual
?85 psi: 7500 lbs single, 14200 lbs dual
?90 psi: 7850 lbs single, 14860 lbs dual
?95 psi: 8200 lbs single, 15520 lbs dual
100 psi: 8540 lbs single, 16160 lbs dual
105 psi: 8880 lbs single, 16800 lbs dual
110 psi: 9220 lbs single, 17440 lbs dual
115 psi: 9550 lbs single, 18080 lbs dual
120 psi: 9880 lbs single, 18700 lbs dual

Of course, you should never exceed the maximum pressure rating for your wheels, nor the maximum pressure stamped on the sidewall of the tire.

Thank You for the information.
Mel

phillyg

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Posted: 07/16/19 06:12pm Link  |  Quote  |  Print  |  Notify Moderator

Doesn't matter what anyone else does. You need to adjust psi to the weight on each axle.


--2005 Ford F350 Lariat Crewcab 6.0, 4x4, 3.73 rear
--2016 Montana 3711FL, 40'
--2014 Wildcat 327CK, 38' SOLD

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